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Magnesium composite bentonite for pelletizing

A technology of bentonite and magnesia, which is applied in the field of magnesia composite bentonite, can solve the problems of reducing calcium ferrite content in sintered ore, reducing the mechanical strength of sintered ore, and high melting point of MgO, so as to strengthen blast furnace smelting, avoid blast furnace accidents, and reduce consumption Effect

Inactive Publication Date: 2014-07-02
王志
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The MgO in the slag of the blast furnace smelting process mainly comes from the sintered ore. Due to the high melting point of MgO, during the sintering process, part of the MgO is solidified in the magnetite to form magnesium magnetite, which will reduce the content of calcium ferrite in the sintered ore, thereby reducing the sintering process. mine mechanical strength
In addition, if the MgO content in sinter is too high, it will also have a great impact on the thermal index

Method used

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  • Magnesium composite bentonite for pelletizing

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Embodiment Construction

[0013] Below in conjunction with embodiment, the present invention will be further described.

[0014] Examples See Table 1 for the components and wt% of magnesia composite bentonite.

[0015] Embodiment 1~4 magnesia composite bentonite component wt% content table

[0016]

[0017] At the same time, MgO and SiO in magnesia composite bentonite should be controlled 2 and water, to ensure that the main chemical components are controlled at: MgO25~30%, SiO 2 45-55%, and moisture <15%.

[0018] The concrete adding method of magnesia composite bentonite of the present invention is:

[0019] According to the requirements of the blast furnace for the MgO content in the pellets, during the batching process of the pellets, the batching ratio is converted into kilograms by weight, controlled by an electronic belt scale, and added to the pellets according to the ratio of 3.5-4.0% of magnesia composite bentonite It can be included in the ore mixture.

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Abstract

The invention provides magnesium composite bentonite for pelletizing. The bentonite comprises the following components in percentage by weight: 20-30% of light-burned magnesite powder, 60-70% of bentonite, 3-5% of sodium carbonate, 2-3% of calcium ricinoleate and 3-5% of calcium chloride; the magnesium composite bentonite comprises the following main chemical components in percentage by weight: 25-30% of MgO, 45-55% of SiO2, and less than 15% of water. By adopting the magnesium composite bentonite disclosed by the invention, the MgO content of a pellet ore can be increased to 1.5%, the mechanical strength of the pellet ore can be increased by 1.5-2%, the initial softening temperature of the pellet ore can be increased by 150-200 DEG C, the MgO content of a sintering ore can be reduced relatively, the quality of the sintering ore can be improved, and the consumption of a sintering fuel can be reduced.

Description

technical field [0001] The invention belongs to the technical field of ironmaking pellets, and in particular relates to a magnesia composite bentonite used for producing pellets in iron and steel enterprise pellet factories. Background technique [0002] At present, the material structure of blast furnace smelting in domestic iron and steel enterprises generally adopts the raw material structure of high-basic sinter and acid pellets. The MgO content in high-basic sinter is about 2.0-2.5%, and the acid pellets do not contain MgO. [0003] MgO mainly plays the role of slagging in the blast furnace smelting process. A certain amount of MgO in molten iron can improve the fluidity of slag, reduce the viscosity of slag, and facilitate the desulfurization of molten iron. The content of MgO in slag is generally required to be within the range of 8-9%. . [0004] The MgO in the slag of the blast furnace smelting process mainly comes from the sintered ore. Due to the high melting poi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24
Inventor 王志赵海元王自力
Owner 王志
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